u/Used-Drive-1904

I took a challenge to meditate for 30 days and today was the first day today I sat on my couch, closed my eyes, and started meditating with a timer of 10 minutes At 6 minutes and 40 seconds, almost near to that point, I felt kind of chill and I felt a fear in my body so I opened my eyes but there was nothing to fear about this. This is something that I want to know: why it happened. I also felt that I had been meditating for way too long like 3 hours and that the day outside my room had become night but it had not and only 6 minutes had passed . Can anyone explain what occurred to me today?